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Rh "Exactly, sir," said Psmith. "My theory, if I may?"

"Certainly, Smith."

Psmith bowed courteously and proceeded.

"My theory, sir, is that Mr. Downing was deceived by the light and shade effects on the toe of the boot. The afternoon sun, streaming in through the window, must have shone on the boot in such a manner as to give it a momentary and fictitious aspect of redness. If Mr. Downing recollects, he did not look long at the boot. The picture on the retina of the eye, consequently, had not time to fade. I remember thinking myself, at the moment, that the boot appeared to have a certain reddish tint. The mistake"

"Bah!" said Mr. Downing shortly.

"Well, really," said the headmaster, "it seems to me that that is the only explanation that will square with the facts. A boot that is really smeared with red paint does not become black of itself in the course of a few minutes."

"You are very right, sir," said Psmith with benevolent approval. "May I go now, sir? I am in the middle of a singularly impressive passage of Cicero's speech De Senectute."

"I am sorry that you should leave your preparation till Sunday, Smith. It is a habit of which I altogether disapprove."

"I am reading it, sir," said Psmith, with simple dignity, "for pleasure. Shall I take the boot with me, sir?"

"If Mr. Downing does not want it?"

The housemaster passed the fraudulent piece of evidence to Psmith without a word, and the latter, having included both masters in a kindly smile, left the garden.

Pedestrians who had the good fortune to be passing along the road between the housemaster's house and Mr. Outwood's at that moment saw what, if they had but known it, was a most unusual sight, the spectacle of Psmith running. Psmith's usual mode of progression